Protection of Rhesus Monkeys against Dengue Virus Challenge after Tetravalent Live Attenuated Dengue Virus Vaccination
Departments of 1Virus Diseases and 2Biologics Research, Division of Communicable Diseases and Immunology, Walter Reed Army Institute of Research, Silver Spring, Maryland; Departments of 3Virology and 4Veterinary Medicine, United States Army Medical Component, Armed Forces Research Institute of Medical Sciences, Bangkok, Thailand
Rhesus monkeys develop viremia after dengue virus (DENV) inoculation and have been used as an animal model to study DENV infection and DENV vaccine candidates. We evaluated, in this model, the protective efficacy of a live attenuated tetravalent DENV vaccine (TDV) candidate against parenteral challenge with parental near‐wild‐type DENV strains. Twenty monkeys were vaccinated with TDV at 0 and 1 month, and 20 unvaccinated monkeys served as controls. Vaccinated animals and their controls were inoculated with 103–104 pfu of challenge virus 4.5 months after the second vaccination. Primary vaccination resulted in 95%, 100%, 70%, and 15% seroconversion to DENV serotypes 1, 2, 3, and 4 (DENV‐1, ‐2, ‐3, and ‐4), respectively. After the second vaccination, the seropositivity rates were 100%, 100%, 90%, and 70%, respectively. Vaccination with TDV resulted in complete protection against viremia from DENV‐2 challenge and in 80%, 80%, and 50% protection against challenge with DENV‐1, ‐3, and ‐4, respectively. Our results suggest that the TDV can elicit protective immunity against all 4 DENV serotypes. Interference among the 4 vaccine viruses may have resulted in decreased antibody responses to DENV‐3 and ‐4, which would require reformulation or dose optimization to minimize this interference during testing of the vaccine in humans.
Received 30 September 2005; accepted 17 November 2005; electronically published 9 May 2006.
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Potential conflicts of interest: Partially on the basis of this study, some authors were named inventors on an awarded patent (6638514), titled “Multivalent dengue vaccine,” filed 24 March 2000 and awarded 28 October 2003.
Financial support: US Army Medical Research and Materiel Command.
The views expressed herein are those of the authors and do not necessarily represent those of the Department of the Army or Department of Defense.
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Present affiliations: Military Infectious Diseases Research Program, Medical Research and Materiel Command, Fort Detrick (D.W.V.), and Division of Communicable Diseases and Immunology, Walter Reed Army Institute of Research, Silver Spring, Maryland (T.P.E.); GlaxoSmithKline, King of Prussia, Pennsylvania (B.L.I.).





